Microsoft is working on a new section called “Experimental Features” that will likely allow Insiders to enable new features in preview builds of Windows 11 if they weren’t automatically activated as part of A/B testing. The new section was announced by the well-known Albacore insider. Unfortunately, this feature is currently not working.
Another insider under the name PhantomOcean3 found a hidden feature in the current builds of Windows 11 for the Dev channel called “AllowExperimentalFeatures”. Most likely, it also belongs to the new section “Experimental features”. It is expected that the innovation will be officially presented in the near future.